Instruction Manual

MicroMag User Manual – March 2010 Page 17 of 23
Table 4-2: Maximum Delay for DRDY
Period Select
Maximum Delay
32
500 μS
64
1.0 mS
128
2.0 mS
256
4.0 mS
512
7.5 mS
1024
15 mS
2048
35.5 mS
4096
60 mS
4.3.6 RESET (Reset)
RESET must be toggled from LOW-HIGH-LOW before sending a measurement
command. RESET is usually LOW.
4.3.7 VDD (DC Voltage Input)
It is recommended the user supply 3.0 VDC on this line, in part because the bias
resistor values on the MicroMag module were optimized for 3.0 VDC operation.
However, the MicroMag can be run at other voltages within the specification.
While not necessary, if the MicroMag will be run at some other voltage it may be
desirable to change the bias resistors for better performance. Refer to the PNI ASIC
User Manual for bias resistor values for other operating voltages. The resistors to be
changed are labeled R1, R2, R3, R4, R6, & R7.
4.3.8 COMP (Comparator)
COMP is only available on the MicroMag2 and it provides the output signal from
the comparator component built into the PNI ASIC. This is used for diagnostics.
4.3.9 DHST (Clock Output)
DHST is only available on the MicroMag2 and it outputs the ASIC’s high speed
clock, but at half the speed. This is used for diagnostics.